Prepare to archive repo (#232)

Author: mfvanek

README.md

@@ -1,4 +1,11 @@
 # pg-index-health-spring-boot-demo
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+---
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+### All codebase moved to the [main repository](https://github.com/mfvanek/pg-index-health-demo).
+
+---
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 Demo app for [pg-index-health library](https://github.com/mfvanek/pg-index-health) (with Spring and Spring Boot).  
 See also [pg-index-health-test-starter](https://github.com/mfvanek/pg-index-health-test-starter) project.